wl12xx/wlcore: rename wl12xx to wlcore

Rename the wl12xx driver directory to wlcore as an initial step
towards the split of the driver into wlcore and wl12xx.  We just
rename the directory first to keep git blame happy.

Signed-off-by: Luciano Coelho <coelho@ti.com>

1 files changed, 1079 insertions, 0 deletions

diff --git a/drivers/net/wireless/ti/wlcore/tx.c b/drivers/net/wireless/ti/wlcore/tx.c
new file mode 100644
index 000000000000..43ae49143d68
--- /dev/null
+++ b/drivers/net/wireless/ti/wlcore/tx.c
@@ -0,0 +1,1079 @@
+/*
+ * This file is part of wl1271
+ *
+ * Copyright (C) 2009 Nokia Corporation
+ *
+ * Contact: Luciano Coelho <luciano.coelho@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/etherdevice.h>
+
+#include "wl12xx.h"
+#include "debug.h"
+#include "io.h"
+#include "reg.h"
+#include "ps.h"
+#include "tx.h"
+#include "event.h"
+
+static int wl1271_set_default_wep_key(struct wl1271 *wl,
+				      struct wl12xx_vif *wlvif, u8 id)
+{
+	int ret;
+	bool is_ap = (wlvif->bss_type == BSS_TYPE_AP_BSS);
+
+	if (is_ap)
+		ret = wl12xx_cmd_set_default_wep_key(wl, id,
+						     wlvif->ap.bcast_hlid);
+	else
+		ret = wl12xx_cmd_set_default_wep_key(wl, id, wlvif->sta.hlid);
+
+	if (ret < 0)
+		return ret;
+
+	wl1271_debug(DEBUG_CRYPT, "default wep key idx: %d", (int)id);
+	return 0;
+}
+
+static int wl1271_alloc_tx_id(struct wl1271 *wl, struct sk_buff *skb)
+{
+	int id;
+
+	id = find_first_zero_bit(wl->tx_frames_map, ACX_TX_DESCRIPTORS);
+	if (id >= ACX_TX_DESCRIPTORS)
+		return -EBUSY;
+
+	__set_bit(id, wl->tx_frames_map);
+	wl->tx_frames[id] = skb;
+	wl->tx_frames_cnt++;
+	return id;
+}
+
+static void wl1271_free_tx_id(struct wl1271 *wl, int id)
+{
+	if (__test_and_clear_bit(id, wl->tx_frames_map)) {
+		if (unlikely(wl->tx_frames_cnt == ACX_TX_DESCRIPTORS))
+			clear_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
+
+		wl->tx_frames[id] = NULL;
+		wl->tx_frames_cnt--;
+	}
+}
+
+static void wl1271_tx_ap_update_inconnection_sta(struct wl1271 *wl,
+						 struct sk_buff *skb)
+{
+	struct ieee80211_hdr *hdr;
+
+	/*
+	 * add the station to the known list before transmitting the
+	 * authentication response. this way it won't get de-authed by FW
+	 * when transmitting too soon.
+	 */
+	hdr = (struct ieee80211_hdr *)(skb->data +
+				       sizeof(struct wl1271_tx_hw_descr));
+	if (ieee80211_is_auth(hdr->frame_control))
+		wl1271_acx_set_inconnection_sta(wl, hdr->addr1);
+}
+
+static void wl1271_tx_regulate_link(struct wl1271 *wl,
+				    struct wl12xx_vif *wlvif,
+				    u8 hlid)
+{
+	bool fw_ps, single_sta;
+	u8 tx_pkts;
+
+	if (WARN_ON(!test_bit(hlid, wlvif->links_map)))
+		return;
+
+	fw_ps = test_bit(hlid, (unsigned long *)&wl->ap_fw_ps_map);
+	tx_pkts = wl->links[hlid].allocated_pkts;
+	single_sta = (wl->active_sta_count == 1);
+
+	/*
+	 * if in FW PS and there is enough data in FW we can put the link
+	 * into high-level PS and clean out its TX queues.
+	 * Make an exception if this is the only connected station. In this
+	 * case FW-memory congestion is not a problem.
+	 */
+	if (!single_sta && fw_ps && tx_pkts >= WL1271_PS_STA_MAX_PACKETS)
+		wl12xx_ps_link_start(wl, wlvif, hlid, true);
+}
+
+bool wl12xx_is_dummy_packet(struct wl1271 *wl, struct sk_buff *skb)
+{
+	return wl->dummy_packet == skb;
+}
+
+u8 wl12xx_tx_get_hlid_ap(struct wl1271 *wl, struct wl12xx_vif *wlvif,
+			 struct sk_buff *skb)
+{
+	struct ieee80211_tx_info *control = IEEE80211_SKB_CB(skb);
+
+	if (control->control.sta) {
+		struct wl1271_station *wl_sta;
+
+		wl_sta = (struct wl1271_station *)
+				control->control.sta->drv_priv;
+		return wl_sta->hlid;
+	} else {
+		struct ieee80211_hdr *hdr;
+
+		if (!test_bit(WLVIF_FLAG_AP_STARTED, &wlvif->flags))
+			return wl->system_hlid;
+
+		hdr = (struct ieee80211_hdr *)skb->data;
+		if (ieee80211_is_mgmt(hdr->frame_control))
+			return wlvif->ap.global_hlid;
+		else
+			return wlvif->ap.bcast_hlid;
+	}
+}
+
+u8 wl12xx_tx_get_hlid(struct wl1271 *wl, struct wl12xx_vif *wlvif,
+		      struct sk_buff *skb)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
+
+	if (!wlvif || wl12xx_is_dummy_packet(wl, skb))
+		return wl->system_hlid;
+
+	if (wlvif->bss_type == BSS_TYPE_AP_BSS)
+		return wl12xx_tx_get_hlid_ap(wl, wlvif, skb);
+
+	if ((test_bit(WLVIF_FLAG_STA_ASSOCIATED, &wlvif->flags) ||
+	     test_bit(WLVIF_FLAG_IBSS_JOINED, &wlvif->flags)) &&
+	    !ieee80211_is_auth(hdr->frame_control) &&
+	    !ieee80211_is_assoc_req(hdr->frame_control))
+		return wlvif->sta.hlid;
+	else
+		return wlvif->dev_hlid;
+}
+
+static unsigned int wl12xx_calc_packet_alignment(struct wl1271 *wl,
+						unsigned int packet_length)
+{
+	if (wl->quirks & WL12XX_QUIRK_NO_BLOCKSIZE_ALIGNMENT)
+		return ALIGN(packet_length, WL1271_TX_ALIGN_TO);
+	else
+		return ALIGN(packet_length, WL12XX_BUS_BLOCK_SIZE);
+}
+
+static int wl1271_tx_allocate(struct wl1271 *wl, struct wl12xx_vif *wlvif,
+			      struct sk_buff *skb, u32 extra, u32 buf_offset,
+			      u8 hlid)
+{
+	struct wl1271_tx_hw_descr *desc;
+	u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
+	u32 len;
+	u32 total_blocks;
+	int id, ret = -EBUSY, ac;
+	u32 spare_blocks = wl->tx_spare_blocks;
+	bool is_dummy = false;
+
+	if (buf_offset + total_len > WL1271_AGGR_BUFFER_SIZE)
+		return -EAGAIN;
+
+	/* allocate free identifier for the packet */
+	id = wl1271_alloc_tx_id(wl, skb);
+	if (id < 0)
+		return id;
+
+	/* approximate the number of blocks required for this packet
+	   in the firmware */
+	len = wl12xx_calc_packet_alignment(wl, total_len);
+
+	/* in case of a dummy packet, use default amount of spare mem blocks */
+	if (unlikely(wl12xx_is_dummy_packet(wl, skb))) {
+		is_dummy = true;
+		spare_blocks = TX_HW_BLOCK_SPARE_DEFAULT;
+	}
+
+	total_blocks = (len + TX_HW_BLOCK_SIZE - 1) / TX_HW_BLOCK_SIZE +
+		spare_blocks;
+
+	if (total_blocks <= wl->tx_blocks_available) {
+		desc = (struct wl1271_tx_hw_descr *)skb_push(
+			skb, total_len - skb->len);
+
+		/* HW descriptor fields change between wl127x and wl128x */
+		if (wl->chip.id == CHIP_ID_1283_PG20) {
+			desc->wl128x_mem.total_mem_blocks = total_blocks;
+		} else {
+			desc->wl127x_mem.extra_blocks = spare_blocks;
+			desc->wl127x_mem.total_mem_blocks = total_blocks;
+		}
+
+		desc->id = id;
+
+		wl->tx_blocks_available -= total_blocks;
+		wl->tx_allocated_blocks += total_blocks;
+
+		/* If the FW was empty before, arm the Tx watchdog */
+		if (wl->tx_allocated_blocks == total_blocks)
+			wl12xx_rearm_tx_watchdog_locked(wl);
+
+		ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
+		wl->tx_allocated_pkts[ac]++;
+
+		if (!is_dummy && wlvif &&
+		    wlvif->bss_type == BSS_TYPE_AP_BSS &&
+		    test_bit(hlid, wlvif->ap.sta_hlid_map))
+			wl->links[hlid].allocated_pkts++;
+
+		ret = 0;
+
+		wl1271_debug(DEBUG_TX,
+			     "tx_allocate: size: %d, blocks: %d, id: %d",
+			     total_len, total_blocks, id);
+	} else {
+		wl1271_free_tx_id(wl, id);
+	}
+
+	return ret;
+}
+
+static void wl1271_tx_fill_hdr(struct wl1271 *wl, struct wl12xx_vif *wlvif,
+			       struct sk_buff *skb, u32 extra,
+			       struct ieee80211_tx_info *control, u8 hlid)
+{
+	struct timespec ts;
+	struct wl1271_tx_hw_descr *desc;
+	int aligned_len, ac, rate_idx;
+	s64 hosttime;
+	u16 tx_attr = 0;
+	__le16 frame_control;
+	struct ieee80211_hdr *hdr;
+	u8 *frame_start;
+	bool is_dummy;
+
+	desc = (struct wl1271_tx_hw_descr *) skb->data;
+	frame_start = (u8 *)(desc + 1);
+	hdr = (struct ieee80211_hdr *)(frame_start + extra);
+	frame_control = hdr->frame_control;
+
+	/* relocate space for security header */
+	if (extra) {
+		int hdrlen = ieee80211_hdrlen(frame_control);
+		memmove(frame_start, hdr, hdrlen);
+	}
+
+	/* configure packet life time */
+	getnstimeofday(&ts);
+	hosttime = (timespec_to_ns(&ts) >> 10);
+	desc->start_time = cpu_to_le32(hosttime - wl->time_offset);
+
+	is_dummy = wl12xx_is_dummy_packet(wl, skb);
+	if (is_dummy || !wlvif || wlvif->bss_type != BSS_TYPE_AP_BSS)
+		desc->life_time = cpu_to_le16(TX_HW_MGMT_PKT_LIFETIME_TU);
+	else
+		desc->life_time = cpu_to_le16(TX_HW_AP_MODE_PKT_LIFETIME_TU);
+
+	/* queue */
+	ac = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
+	desc->tid = skb->priority;
+
+	if (is_dummy) {
+		/*
+		 * FW expects the dummy packet to have an invalid session id -
+		 * any session id that is different than the one set in the join
+		 */
+		tx_attr = (SESSION_COUNTER_INVALID <<
+			   TX_HW_ATTR_OFST_SESSION_COUNTER) &
+			   TX_HW_ATTR_SESSION_COUNTER;
+
+		tx_attr |= TX_HW_ATTR_TX_DUMMY_REQ;
+	} else if (wlvif) {
+		/* configure the tx attributes */
+		tx_attr = wlvif->session_counter <<
+			  TX_HW_ATTR_OFST_SESSION_COUNTER;
+	}
+
+	desc->hlid = hlid;
+	if (is_dummy || !wlvif)
+		rate_idx = 0;
+	else if (wlvif->bss_type != BSS_TYPE_AP_BSS) {
+		/* if the packets are destined for AP (have a STA entry)
+		   send them with AP rate policies, otherwise use default
+		   basic rates */
+		if (control->flags & IEEE80211_TX_CTL_NO_CCK_RATE)
+			rate_idx = wlvif->sta.p2p_rate_idx;
+		else if (control->control.sta)
+			rate_idx = wlvif->sta.ap_rate_idx;
+		else
+			rate_idx = wlvif->sta.basic_rate_idx;
+	} else {
+		if (hlid == wlvif->ap.global_hlid)
+			rate_idx = wlvif->ap.mgmt_rate_idx;
+		else if (hlid == wlvif->ap.bcast_hlid)
+			rate_idx = wlvif->ap.bcast_rate_idx;
+		else
+			rate_idx = wlvif->ap.ucast_rate_idx[ac];
+	}
+
+	tx_attr |= rate_idx << TX_HW_ATTR_OFST_RATE_POLICY;
+	desc->reserved = 0;
+
+	aligned_len = wl12xx_calc_packet_alignment(wl, skb->len);
+
+	if (wl->chip.id == CHIP_ID_1283_PG20) {
+		desc->wl128x_mem.extra_bytes = aligned_len - skb->len;
+		desc->length = cpu_to_le16(aligned_len >> 2);
+
+		wl1271_debug(DEBUG_TX, "tx_fill_hdr: hlid: %d "
+			     "tx_attr: 0x%x len: %d life: %d mem: %d",
+			     desc->hlid, tx_attr,
+			     le16_to_cpu(desc->length),
+			     le16_to_cpu(desc->life_time),
+			     desc->wl128x_mem.total_mem_blocks);
+	} else {
+		int pad;
+
+		/* Store the aligned length in terms of words */
+		desc->length = cpu_to_le16(aligned_len >> 2);
+
+		/* calculate number of padding bytes */
+		pad = aligned_len - skb->len;
+		tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
+
+		wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d hlid: %d "
+			     "tx_attr: 0x%x len: %d life: %d mem: %d", pad,
+			     desc->hlid, tx_attr,
+			     le16_to_cpu(desc->length),
+			     le16_to_cpu(desc->life_time),
+			     desc->wl127x_mem.total_mem_blocks);
+	}
+
+	/* for WEP shared auth - no fw encryption is needed */
+	if (ieee80211_is_auth(frame_control) &&
+	    ieee80211_has_protected(frame_control))
+		tx_attr |= TX_HW_ATTR_HOST_ENCRYPT;
+
+	desc->tx_attr = cpu_to_le16(tx_attr);
+}
+
+/* caller must hold wl->mutex */
+static int wl1271_prepare_tx_frame(struct wl1271 *wl, struct wl12xx_vif *wlvif,
+				   struct sk_buff *skb, u32 buf_offset)
+{
+	struct ieee80211_tx_info *info;
+	u32 extra = 0;
+	int ret = 0;
+	u32 total_len;
+	u8 hlid;
+	bool is_dummy;
+
+	if (!skb)
+		return -EINVAL;
+
+	info = IEEE80211_SKB_CB(skb);
+
+	/* TODO: handle dummy packets on multi-vifs */
+	is_dummy = wl12xx_is_dummy_packet(wl, skb);
+
+	if (info->control.hw_key &&
+	    info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP)
+		extra = WL1271_EXTRA_SPACE_TKIP;
+
+	if (info->control.hw_key) {
+		bool is_wep;
+		u8 idx = info->control.hw_key->hw_key_idx;
+		u32 cipher = info->control.hw_key->cipher;
+
+		is_wep = (cipher == WLAN_CIPHER_SUITE_WEP40) ||
+			 (cipher == WLAN_CIPHER_SUITE_WEP104);
+
+		if (unlikely(is_wep && wlvif->default_key != idx)) {
+			ret = wl1271_set_default_wep_key(wl, wlvif, idx);
+			if (ret < 0)
+				return ret;
+			wlvif->default_key = idx;
+		}
+	}
+	hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
+	if (hlid == WL12XX_INVALID_LINK_ID) {
+		wl1271_error("invalid hlid. dropping skb 0x%p", skb);
+		return -EINVAL;
+	}
+
+	ret = wl1271_tx_allocate(wl, wlvif, skb, extra, buf_offset, hlid);
+	if (ret < 0)
+		return ret;
+
+	wl1271_tx_fill_hdr(wl, wlvif, skb, extra, info, hlid);
+
+	if (!is_dummy && wlvif && wlvif->bss_type == BSS_TYPE_AP_BSS) {
+		wl1271_tx_ap_update_inconnection_sta(wl, skb);
+		wl1271_tx_regulate_link(wl, wlvif, hlid);
+	}
+
+	/*
+	 * The length of each packet is stored in terms of
+	 * words. Thus, we must pad the skb data to make sure its
+	 * length is aligned.  The number of padding bytes is computed
+	 * and set in wl1271_tx_fill_hdr.
+	 * In special cases, we want to align to a specific block size
+	 * (eg. for wl128x with SDIO we align to 256).
+	 */
+	total_len = wl12xx_calc_packet_alignment(wl, skb->len);
+
+	memcpy(wl->aggr_buf + buf_offset, skb->data, skb->len);
+	memset(wl->aggr_buf + buf_offset + skb->len, 0, total_len - skb->len);
+
+	/* Revert side effects in the dummy packet skb, so it can be reused */
+	if (is_dummy)
+		skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
+
+	return total_len;
+}
+
+u32 wl1271_tx_enabled_rates_get(struct wl1271 *wl, u32 rate_set,
+				enum ieee80211_band rate_band)
+{
+	struct ieee80211_supported_band *band;
+	u32 enabled_rates = 0;
+	int bit;
+
+	band = wl->hw->wiphy->bands[rate_band];
+	for (bit = 0; bit < band->n_bitrates; bit++) {
+		if (rate_set & 0x1)
+			enabled_rates |= band->bitrates[bit].hw_value;
+		rate_set >>= 1;
+	}
+
+	/* MCS rates indication are on bits 16 - 23 */
+	rate_set >>= HW_HT_RATES_OFFSET - band->n_bitrates;
+
+	for (bit = 0; bit < 8; bit++) {
+		if (rate_set & 0x1)
+			enabled_rates |= (CONF_HW_BIT_RATE_MCS_0 << bit);
+		rate_set >>= 1;
+	}
+
+	return enabled_rates;
+}
+
+void wl1271_handle_tx_low_watermark(struct wl1271 *wl)
+{
+	unsigned long flags;
+	int i;
+
+	for (i = 0; i < NUM_TX_QUEUES; i++) {
+		if (test_bit(i, &wl->stopped_queues_map) &&
+		    wl->tx_queue_count[i] <= WL1271_TX_QUEUE_LOW_WATERMARK) {
+			/* firmware buffer has space, restart queues */
+			spin_lock_irqsave(&wl->wl_lock, flags);
+			ieee80211_wake_queue(wl->hw,
+					     wl1271_tx_get_mac80211_queue(i));
+			clear_bit(i, &wl->stopped_queues_map);
+			spin_unlock_irqrestore(&wl->wl_lock, flags);
+		}
+	}
+}
+
+static struct sk_buff_head *wl1271_select_queue(struct wl1271 *wl,
+						struct sk_buff_head *queues)
+{
+	int i, q = -1, ac;
+	u32 min_pkts = 0xffffffff;
+
+	/*
+	 * Find a non-empty ac where:
+	 * 1. There are packets to transmit
+	 * 2. The FW has the least allocated blocks
+	 *
+	 * We prioritize the ACs according to VO>VI>BE>BK
+	 */
+	for (i = 0; i < NUM_TX_QUEUES; i++) {
+		ac = wl1271_tx_get_queue(i);
+		if (!skb_queue_empty(&queues[ac]) &&
+		    (wl->tx_allocated_pkts[ac] < min_pkts)) {
+			q = ac;
+			min_pkts = wl->tx_allocated_pkts[q];
+		}
+	}
+
+	if (q == -1)
+		return NULL;
+
+	return &queues[q];
+}
+
+static struct sk_buff *wl12xx_lnk_skb_dequeue(struct wl1271 *wl,
+					      struct wl1271_link *lnk)
+{
+	struct sk_buff *skb;
+	unsigned long flags;
+	struct sk_buff_head *queue;
+
+	queue = wl1271_select_queue(wl, lnk->tx_queue);
+	if (!queue)
+		return NULL;
+
+	skb = skb_dequeue(queue);
+	if (skb) {
+		int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
+		spin_lock_irqsave(&wl->wl_lock, flags);
+		WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
+		wl->tx_queue_count[q]--;
+		spin_unlock_irqrestore(&wl->wl_lock, flags);
+	}
+
+	return skb;
+}
+
+static struct sk_buff *wl12xx_vif_skb_dequeue(struct wl1271 *wl,
+					      struct wl12xx_vif *wlvif)
+{
+	struct sk_buff *skb = NULL;
+	int i, h, start_hlid;
+
+	/* start from the link after the last one */
+	start_hlid = (wlvif->last_tx_hlid + 1) % WL12XX_MAX_LINKS;
+
+	/* dequeue according to AC, round robin on each link */
+	for (i = 0; i < WL12XX_MAX_LINKS; i++) {
+		h = (start_hlid + i) % WL12XX_MAX_LINKS;
+
+		/* only consider connected stations */
+		if (!test_bit(h, wlvif->links_map))
+			continue;
+
+		skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[h]);
+		if (!skb)
+			continue;
+
+		wlvif->last_tx_hlid = h;
+		break;
+	}
+
+	if (!skb)
+		wlvif->last_tx_hlid = 0;
+
+	return skb;
+}
+
+static struct sk_buff *wl1271_skb_dequeue(struct wl1271 *wl)
+{
+	unsigned long flags;
+	struct wl12xx_vif *wlvif = wl->last_wlvif;
+	struct sk_buff *skb = NULL;
+
+	/* continue from last wlvif (round robin) */
+	if (wlvif) {
+		wl12xx_for_each_wlvif_continue(wl, wlvif) {
+			skb = wl12xx_vif_skb_dequeue(wl, wlvif);
+			if (skb) {
+				wl->last_wlvif = wlvif;
+				break;
+			}
+		}
+	}
+
+	/* dequeue from the system HLID before the restarting wlvif list */
+	if (!skb)
+		skb = wl12xx_lnk_skb_dequeue(wl, &wl->links[wl->system_hlid]);
+
+	/* do a new pass over the wlvif list */
+	if (!skb) {
+		wl12xx_for_each_wlvif(wl, wlvif) {
+			skb = wl12xx_vif_skb_dequeue(wl, wlvif);
+			if (skb) {
+				wl->last_wlvif = wlvif;
+				break;
+			}
+
+			/*
+			 * No need to continue after last_wlvif. The previous
+			 * pass should have found it.
+			 */
+			if (wlvif == wl->last_wlvif)
+				break;
+		}
+	}
+
+	if (!skb &&
+	    test_and_clear_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags)) {
+		int q;
+
+		skb = wl->dummy_packet;
+		q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
+		spin_lock_irqsave(&wl->wl_lock, flags);
+		WARN_ON_ONCE(wl->tx_queue_count[q] <= 0);
+		wl->tx_queue_count[q]--;
+		spin_unlock_irqrestore(&wl->wl_lock, flags);
+	}
+
+	return skb;
+}
+
+static void wl1271_skb_queue_head(struct wl1271 *wl, struct wl12xx_vif *wlvif,
+				  struct sk_buff *skb)
+{
+	unsigned long flags;
+	int q = wl1271_tx_get_queue(skb_get_queue_mapping(skb));
+
+	if (wl12xx_is_dummy_packet(wl, skb)) {
+		set_bit(WL1271_FLAG_DUMMY_PACKET_PENDING, &wl->flags);
+	} else {
+		u8 hlid = wl12xx_tx_get_hlid(wl, wlvif, skb);
+		skb_queue_head(&wl->links[hlid].tx_queue[q], skb);
+
+		/* make sure we dequeue the same packet next time */
+		wlvif->last_tx_hlid = (hlid + WL12XX_MAX_LINKS - 1) %
+				      WL12XX_MAX_LINKS;
+	}
+
+	spin_lock_irqsave(&wl->wl_lock, flags);
+	wl->tx_queue_count[q]++;
+	spin_unlock_irqrestore(&wl->wl_lock, flags);
+}
+
+static bool wl1271_tx_is_data_present(struct sk_buff *skb)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)(skb->data);
+
+	return ieee80211_is_data_present(hdr->frame_control);
+}
+
+void wl12xx_rearm_rx_streaming(struct wl1271 *wl, unsigned long *active_hlids)
+{
+	struct wl12xx_vif *wlvif;
+	u32 timeout;
+	u8 hlid;
+
+	if (!wl->conf.rx_streaming.interval)
+		return;
+
+	if (!wl->conf.rx_streaming.always &&
+	    !test_bit(WL1271_FLAG_SOFT_GEMINI, &wl->flags))
+		return;
+
+	timeout = wl->conf.rx_streaming.duration;
+	wl12xx_for_each_wlvif_sta(wl, wlvif) {
+		bool found = false;
+		for_each_set_bit(hlid, active_hlids, WL12XX_MAX_LINKS) {
+			if (test_bit(hlid, wlvif->links_map)) {
+				found  = true;
+				break;
+			}
+		}
+
+		if (!found)
+			continue;
+
+		/* enable rx streaming */
+		if (!test_bit(WLVIF_FLAG_RX_STREAMING_STARTED, &wlvif->flags))
+			ieee80211_queue_work(wl->hw,
+					     &wlvif->rx_streaming_enable_work);
+
+		mod_timer(&wlvif->rx_streaming_timer,
+			  jiffies + msecs_to_jiffies(timeout));
+	}
+}
+
+void wl1271_tx_work_locked(struct wl1271 *wl)
+{
+	struct wl12xx_vif *wlvif;
+	struct sk_buff *skb;
+	struct wl1271_tx_hw_descr *desc;
+	u32 buf_offset = 0;
+	bool sent_packets = false;
+	unsigned long active_hlids[BITS_TO_LONGS(WL12XX_MAX_LINKS)] = {0};
+	int ret;
+
+	if (unlikely(wl->state == WL1271_STATE_OFF))
+		return;
+
+	while ((skb = wl1271_skb_dequeue(wl))) {
+		struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+		bool has_data = false;
+
+		wlvif = NULL;
+		if (!wl12xx_is_dummy_packet(wl, skb) && info->control.vif)
+			wlvif = wl12xx_vif_to_data(info->control.vif);
+
+		has_data = wlvif && wl1271_tx_is_data_present(skb);
+		ret = wl1271_prepare_tx_frame(wl, wlvif, skb, buf_offset);
+		if (ret == -EAGAIN) {
+			/*
+			 * Aggregation buffer is full.
+			 * Flush buffer and try again.
+			 */
+			wl1271_skb_queue_head(wl, wlvif, skb);
+			wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
+				     buf_offset, true);
+			sent_packets = true;
+			buf_offset = 0;
+			continue;
+		} else if (ret == -EBUSY) {
+			/*
+			 * Firmware buffer is full.
+			 * Queue back last skb, and stop aggregating.
+			 */
+			wl1271_skb_queue_head(wl, wlvif, skb);
+			/* No work left, avoid scheduling redundant tx work */
+			set_bit(WL1271_FLAG_FW_TX_BUSY, &wl->flags);
+			goto out_ack;
+		} else if (ret < 0) {
+			if (wl12xx_is_dummy_packet(wl, skb))
+				/*
+				 * fw still expects dummy packet,
+				 * so re-enqueue it
+				 */
+				wl1271_skb_queue_head(wl, wlvif, skb);
+			else
+				ieee80211_free_txskb(wl->hw, skb);
+			goto out_ack;
+		}
+		buf_offset += ret;
+		wl->tx_packets_count++;
+		if (has_data) {
+			desc = (struct wl1271_tx_hw_descr *) skb->data;
+			__set_bit(desc->hlid, active_hlids);
+		}
+	}
+
+out_ack:
+	if (buf_offset) {
+		wl1271_write(wl, WL1271_SLV_MEM_DATA, wl->aggr_buf,
+				buf_offset, true);
+		sent_packets = true;
+	}
+	if (sent_packets) {
+		/*
+		 * Interrupt the firmware with the new packets. This is only
+		 * required for older hardware revisions
+		 */
+		if (wl->quirks & WL12XX_QUIRK_END_OF_TRANSACTION)
+			wl1271_write32(wl, WL1271_HOST_WR_ACCESS,
+				       wl->tx_packets_count);
+
+		wl1271_handle_tx_low_watermark(wl);
+	}
+	wl12xx_rearm_rx_streaming(wl, active_hlids);
+}
+
+void wl1271_tx_work(struct work_struct *work)
+{
+	struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
+	int ret;
+
+	mutex_lock(&wl->mutex);
+	ret = wl1271_ps_elp_wakeup(wl);
+	if (ret < 0)
+		goto out;
+
+	wl1271_tx_work_locked(wl);
+
+	wl1271_ps_elp_sleep(wl);
+out:
+	mutex_unlock(&wl->mutex);
+}
+
+static u8 wl1271_tx_get_rate_flags(u8 rate_class_index)
+{
+	u8 flags = 0;
+
+	if (rate_class_index >= CONF_HW_RXTX_RATE_MCS_MIN &&
+	    rate_class_index <= CONF_HW_RXTX_RATE_MCS_MAX)
+		flags |= IEEE80211_TX_RC_MCS;
+	if (rate_class_index == CONF_HW_RXTX_RATE_MCS7_SGI)
+		flags |= IEEE80211_TX_RC_SHORT_GI;
+	return flags;
+}
+
+static void wl1271_tx_complete_packet(struct wl1271 *wl,
+				      struct wl1271_tx_hw_res_descr *result)
+{
+	struct ieee80211_tx_info *info;
+	struct ieee80211_vif *vif;
+	struct wl12xx_vif *wlvif;
+	struct sk_buff *skb;
+	int id = result->id;
+	int rate = -1;
+	u8 rate_flags = 0;
+	u8 retries = 0;
+
+	/* check for id legality */
+	if (unlikely(id >= ACX_TX_DESCRIPTORS || wl->tx_frames[id] == NULL)) {
+		wl1271_warning("TX result illegal id: %d", id);
+		return;
+	}
+
+	skb = wl->tx_frames[id];
+	info = IEEE80211_SKB_CB(skb);
+
+	if (wl12xx_is_dummy_packet(wl, skb)) {
+		wl1271_free_tx_id(wl, id);
+		return;
+	}
+
+	/* info->control is valid as long as we don't update info->status */
+	vif = info->control.vif;
+	wlvif = wl12xx_vif_to_data(vif);
+
+	/* update the TX status info */
+	if (result->status == TX_SUCCESS) {
+		if (!(info->flags & IEEE80211_TX_CTL_NO_ACK))
+			info->flags |= IEEE80211_TX_STAT_ACK;
+		rate = wl1271_rate_to_idx(result->rate_class_index,
+					  wlvif->band);
+		rate_flags = wl1271_tx_get_rate_flags(result->rate_class_index);
+		retries = result->ack_failures;
+	} else if (result->status == TX_RETRY_EXCEEDED) {
+		wl->stats.excessive_retries++;
+		retries = result->ack_failures;
+	}
+
+	info->status.rates[0].idx = rate;
+	info->status.rates[0].count = retries;
+	info->status.rates[0].flags = rate_flags;
+	info->status.ack_signal = -1;
+
+	wl->stats.retry_count += result->ack_failures;
+
+	/*
+	 * update sequence number only when relevant, i.e. only in
+	 * sessions of TKIP, AES and GEM (not in open or WEP sessions)
+	 */
+	if (info->control.hw_key &&
+	    (info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP ||
+	     info->control.hw_key->cipher == WLAN_CIPHER_SUITE_CCMP ||
+	     info->control.hw_key->cipher == WL1271_CIPHER_SUITE_GEM)) {
+		u8 fw_lsb = result->tx_security_sequence_number_lsb;
+		u8 cur_lsb = wlvif->tx_security_last_seq_lsb;
+
+		/*
+		 * update security sequence number, taking care of potential
+		 * wrap-around
+		 */
+		wlvif->tx_security_seq += (fw_lsb - cur_lsb) & 0xff;
+		wlvif->tx_security_last_seq_lsb = fw_lsb;
+	}
+
+	/* remove private header from packet */
+	skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
+
+	/* remove TKIP header space if present */
+	if (info->control.hw_key &&
+	    info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
+		int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
+		memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data,
+			hdrlen);
+		skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
+	}
+
+	wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
+		     " status 0x%x",
+		     result->id, skb, result->ack_failures,
+		     result->rate_class_index, result->status);
+
+	/* return the packet to the stack */
+	skb_queue_tail(&wl->deferred_tx_queue, skb);
+	queue_work(wl->freezable_wq, &wl->netstack_work);
+	wl1271_free_tx_id(wl, result->id);
+}
+
+/* Called upon reception of a TX complete interrupt */
+void wl1271_tx_complete(struct wl1271 *wl)
+{
+	struct wl1271_acx_mem_map *memmap =
+		(struct wl1271_acx_mem_map *)wl->target_mem_map;
+	u32 count, fw_counter;
+	u32 i;
+
+	/* read the tx results from the chipset */
+	wl1271_read(wl, le32_to_cpu(memmap->tx_result),
+		    wl->tx_res_if, sizeof(*wl->tx_res_if), false);
+	fw_counter = le32_to_cpu(wl->tx_res_if->tx_result_fw_counter);
+
+	/* write host counter to chipset (to ack) */
+	wl1271_write32(wl, le32_to_cpu(memmap->tx_result) +
+		       offsetof(struct wl1271_tx_hw_res_if,
+				tx_result_host_counter), fw_counter);
+
+	count = fw_counter - wl->tx_results_count;
+	wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
+
+	/* verify that the result buffer is not getting overrun */
+	if (unlikely(count > TX_HW_RESULT_QUEUE_LEN))
+		wl1271_warning("TX result overflow from chipset: %d", count);
+
+	/* process the results */
+	for (i = 0; i < count; i++) {
+		struct wl1271_tx_hw_res_descr *result;
+		u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
+
+		/* process the packet */
+		result =  &(wl->tx_res_if->tx_results_queue[offset]);
+		wl1271_tx_complete_packet(wl, result);
+
+		wl->tx_results_count++;
+	}
+}
+
+void wl1271_tx_reset_link_queues(struct wl1271 *wl, u8 hlid)
+{
+	struct sk_buff *skb;
+	int i;
+	unsigned long flags;
+	struct ieee80211_tx_info *info;
+	int total[NUM_TX_QUEUES];
+
+	for (i = 0; i < NUM_TX_QUEUES; i++) {
+		total[i] = 0;
+		while ((skb = skb_dequeue(&wl->links[hlid].tx_queue[i]))) {
+			wl1271_debug(DEBUG_TX, "link freeing skb 0x%p", skb);
+
+			if (!wl12xx_is_dummy_packet(wl, skb)) {
+				info = IEEE80211_SKB_CB(skb);
+				info->status.rates[0].idx = -1;
+				info->status.rates[0].count = 0;
+				ieee80211_tx_status_ni(wl->hw, skb);
+			}
+
+			total[i]++;
+		}
+	}
+
+	spin_lock_irqsave(&wl->wl_lock, flags);
+	for (i = 0; i < NUM_TX_QUEUES; i++)
+		wl->tx_queue_count[i] -= total[i];
+	spin_unlock_irqrestore(&wl->wl_lock, flags);
+
+	wl1271_handle_tx_low_watermark(wl);
+}
+
+/* caller must hold wl->mutex and TX must be stopped */
+void wl12xx_tx_reset_wlvif(struct wl1271 *wl, struct wl12xx_vif *wlvif)
+{
+	int i;
+
+	/* TX failure */
+	for_each_set_bit(i, wlvif->links_map, WL12XX_MAX_LINKS) {
+		if (wlvif->bss_type == BSS_TYPE_AP_BSS)
+			wl1271_free_sta(wl, wlvif, i);
+		else
+			wlvif->sta.ba_rx_bitmap = 0;
+
+		wl->links[i].allocated_pkts = 0;
+		wl->links[i].prev_freed_pkts = 0;
+	}
+	wlvif->last_tx_hlid = 0;
+
+}
+/* caller must hold wl->mutex and TX must be stopped */
+void wl12xx_tx_reset(struct wl1271 *wl, bool reset_tx_queues)
+{
+	int i;
+	struct sk_buff *skb;
+	struct ieee80211_tx_info *info;
+
+	/* only reset the queues if something bad happened */
+	if (WARN_ON_ONCE(wl1271_tx_total_queue_count(wl) != 0)) {
+		for (i = 0; i < WL12XX_MAX_LINKS; i++)
+			wl1271_tx_reset_link_queues(wl, i);
+
+		for (i = 0; i < NUM_TX_QUEUES; i++)
+			wl->tx_queue_count[i] = 0;
+	}
+
+	wl->stopped_queues_map = 0;
+
+	/*
+	 * Make sure the driver is at a consistent state, in case this
+	 * function is called from a context other than interface removal.
+	 * This call will always wake the TX queues.
+	 */
+	if (reset_tx_queues)
+		wl1271_handle_tx_low_watermark(wl);
+
+	for (i = 0; i < ACX_TX_DESCRIPTORS; i++) {
+		if (wl->tx_frames[i] == NULL)
+			continue;
+
+		skb = wl->tx_frames[i];
+		wl1271_free_tx_id(wl, i);
+		wl1271_debug(DEBUG_TX, "freeing skb 0x%p", skb);
+
+		if (!wl12xx_is_dummy_packet(wl, skb)) {
+			/*
+			 * Remove private headers before passing the skb to
+			 * mac80211
+			 */
+			info = IEEE80211_SKB_CB(skb);
+			skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
+			if (info->control.hw_key &&
+			    info->control.hw_key->cipher ==
+			    WLAN_CIPHER_SUITE_TKIP) {
+				int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
+				memmove(skb->data + WL1271_EXTRA_SPACE_TKIP,
+					skb->data, hdrlen);
+				skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
+			}
+
+			info->status.rates[0].idx = -1;
+			info->status.rates[0].count = 0;
+
+			ieee80211_tx_status_ni(wl->hw, skb);
+		}
+	}
+}
+
+#define WL1271_TX_FLUSH_TIMEOUT 500000
+
+/* caller must *NOT* hold wl->mutex */
+void wl1271_tx_flush(struct wl1271 *wl)
+{
+	unsigned long timeout;
+	int i;
+	timeout = jiffies + usecs_to_jiffies(WL1271_TX_FLUSH_TIMEOUT);
+
+	while (!time_after(jiffies, timeout)) {
+		mutex_lock(&wl->mutex);
+		wl1271_debug(DEBUG_TX, "flushing tx buffer: %d %d",
+			     wl->tx_frames_cnt,
+			     wl1271_tx_total_queue_count(wl));
+		if ((wl->tx_frames_cnt == 0) &&
+		    (wl1271_tx_total_queue_count(wl) == 0)) {
+			mutex_unlock(&wl->mutex);
+			return;
+		}
+		mutex_unlock(&wl->mutex);
+		msleep(1);
+	}
+
+	wl1271_warning("Unable to flush all TX buffers, timed out.");
+
+	/* forcibly flush all Tx buffers on our queues */
+	mutex_lock(&wl->mutex);
+	for (i = 0; i < WL12XX_MAX_LINKS; i++)
+		wl1271_tx_reset_link_queues(wl, i);
+	mutex_unlock(&wl->mutex);
+}
+
+u32 wl1271_tx_min_rate_get(struct wl1271 *wl, u32 rate_set)
+{
+	if (WARN_ON(!rate_set))
+		return 0;
+
+	return BIT(__ffs(rate_set));
+}